GitHub user zuyu opened a pull request:
https://github.com/apache/incubator-quickstep/pull/354
Fixed the union-all elimiation case where some project expression is not an
AttributeReference.
This PR fixed for the case where the only one child of the union-all query
is non-empty, and the child has a non-AttributeReference project expression:
```
SELECT 1 AS a FROM not_empty
UNION ALL
SELECT 0 AS a FROM empty;
```
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/zuyu/incubator-quickstep
eliminate-empty-node-bug-fix
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-quickstep/pull/354.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #354
----
commit f7d1132672f4ef6399dbbe77541f93911c2d640b
Author: Zuyu Zhang <zuyu@...>
Date: 2018-05-08T04:58:35Z
Fixed the union-all elimiation case where some project expression is not an
AttributeReference.
----
---
